Muffler for internal-combustion engines



April 14, 1931.

H. S. POWELL MUFFLER FOR INTERNAL COMBUSTION ENGINES Filed May 18, 1928 lo I 5/ /i/ f E 195 HWMP aw Patented Apr. 14, 1931 PATENT OFFICE HERBERT S. POWELL, OI 'U'II'ICA NEW YORK MUFFLER FOR INTERNAL-COMBUSTION ENGINES Application filed May 18, 1928. Serial No. 278,889.

p the exhaust gases of an internal combustion engine upon reaching the atmosphere. To this end, the mufller is equipped with expand- 15 ing and contracting chambers and with pockets to aid in decreasing the vibrations of said mufl ler and also to aid in silencing the noise incident to the exhaust gases escaping to atmosphere.

7 The object will be understood by referring to the drawings in which:

Fig. 1 is a central vertical section of the mufller showing parts in full.

Fig. 2 is a central vertical section of a modified form of the mufller.

Referring to the drawings more particularly, the device embodies a plurality of interfitting cups. The cups are made to interfit by shaping the free edge, with the exception of the first cup, into an annular shoulder 1 adapted to provide a seat for nesting the adjacent bottom edge of the preceding cup. The cups and end members 3 and 5 are "held together by stay rods 8, 8. Tube 9 forms 'an inlet port and is fastened to end member 3 by spinning ortions adjacent the end of tube '9 to the e ge thereof bordering on the central aperture;

A cylindrical tube 10 is welded at one end to an annular shoulder 11 formed integral with end member 3 and is adapted to project through the chambers formed by the first two cups 15 and 16 and partly into the chamber formed by cu -17. Tube 10 is in alignment although muc h larger in diameter than inlet tube 9, whereby to permit the exhaust gases to expand to a certain degree on reaching said tube 10. The bottom surfaces of cups 15 and 16 are cutaway to provide large central apertures for the projection of tube iling the upper part thereof to the edge of bottom 21 adjacent the central aperture,

- whereby the exhaust gases will be contracted before entering the chambers of cups 22 and 23. The bottom surfaces of cup 22 is cut away to provide a large central aperture at 24 and thereby leave only a narrow unperforated flange 25, whereby to permit the exhaust gases to expand through a portion of the chamber of cup 22 and through the chamber of cup 23. Moreover, a conical shaped member 20 is spun to the bottom of surface of cups 23 and 25, whereas cup 24 has a large central aperture 30 and narrow unperforated flange 31, whereby to cause the exhaust gases to expand as above explained in their passage through a portion of cup 24 and cup 25 and then contract while passing through. conical shaped member 20 of cup 25. Cup 32 is equlpped with a large central aperture leaving only a narrow unperforated flange 37 whereby to allow the exhaust gases to expand into the chamber ofcup 33. Cups 33 and 34, however, are equipped with a plurality of small apertures 36 in the bottom surface thereof, in each instance; whereby to further break up and segregate the onrushing exhaust gases. Cup 35 has spun to the bottom thereof a cylindrical open tube 40 for the passage of the exhaust gases to a tube 41 of larger diameter projecting through end member 5 and spun thereto. An open tube 42 of snfaller diameter is spun to the end surface 43 of tube 41, whereby to permit the exhaust gases to escape to atmosphere.

Cup 37 has a large central aperture leaving only a narrow unperforated flange 38, whereby to form an annular pocket or cushion chamber at 43 adapted toallow the exhaust gases to enter by way of annular opening 44 between the inner surface of tube 41 and the outer surface of tube 40, whereby I to aid in silencing the noise of the escapingexhaust gases and to lessen the vibration of the muflier.

The operation of the muflier is as follows: When the exhaust gases enter the muflier by way of tube 9 they progress through tube 10 to the chamber of cup 17, some rebounding, however, into the annular spacebetween the outer surface of tubelO and theinner sur-- face of cups 15 and 16 to aid in lessening the vibration of the muflier whence they will be gradually redrawn into the chamber of cup will be broken up and segregated as they pass a through thesmall apertures 36 of cups 33 and 34. Thereafter the exhaust gases will escape to atmosphere through open tubes 40, 41 and 42. A small portion, however, of said gases will rebound into the annular chamber 'or ocket 43* formed between the outer surface of tube and the inner surface of cups 37 and 45, by way of annular opening H between the outer surface of tube 40 and the upper inner surface of tube 41, to form a cushion to aid in silencing the noise of the exhaust gases as theypass to atmosphere, as well as to aid in lessening the vibration of the muffler. Thisvcushion will aid in deadening the sound of the inrushing air to the muflier in' the event of a quick closing of the throttle of the automobile; not shown.

A modification of the mufiler is shown in Fig. 2. Here the outer cylindrical shell or tube 50 is made in one piece in contradistinction to the plurality of cups described in the former construction. Tube 50 is subdivided by cupor saucer shaped partitions 51, 51, 51, 52 and 53, which are welded to:

. gases as they gress from chamberw 61 to chamber 66 and from chamber 66 to chamber 67 and from chamber 67 to 68. Partition 52, however, is equipped with a plurality of apertures 69 for breaking up and segregating the exhaust progress therethrough into chamber 69. Partition 53 has projecting therethrough and spun thereto an open cylindrical tube 70 in'alignment with the other tubes and of the natural progress of the gases. Moreover, a tube 75 of larger diameter than tube 70 projects through and is spun to end member 56. Another tube 77 of larger dianTeter than tube 75 is spun to the end closing part 78 of tube 7 5. Tube 77 is open at each end to allow for the escape of the exhaust gases to atmosphere. Furthermore, tube 70 although projecting into tube 75 allows for an annular space at 80, between its outer surface and the inner surface of tube 75, whereby to provide an opening through which some of the exhaust gases will rebound into the annular pocket 81 to form a cushion adapted to lessenthe vibration of the mufiier and to decrease the noise incident to the exhaust gases escaping to atmosphere through open tube 77.

Having thus described my invention what I claimas new and desire to secure by Let ters Patent is as follows:

In a muflier for internal combustion enines, cups having large central apertures ormed therein for per1nittingthe exhaust gases to expand, cups having conical shaped members mounted therein for contracting said gases, a pocket formed at one end of said mufller to aid in lessening the vibration and deadening the sound of the exhaust gases, pertain. other cups having small apertures formed therein to segregate said exhaust gases and another pocket formed at the opposite end of said muflier to aid in lessening the vibration and deadeningthe sound of the exhaust gases;

In testimony whereof I have aflixed mysignature.

HERBERT S. POWELL.

the inner surface of tube 50. The ends are closed also by cup shaped members and 56.

An inlet tube is seamed to end member 55 for theadmission of the exhaust gases from the engine, 57 of larger diameter than inlet tube 60 is disposed in the first chamber 61 in alignment with tube 60 and is welded to the inner sur face of end member 55. Tube '57 will form w an annular pocket at 62 into which some of the exhaust gases will rebound to effect a cushion which will tend to eliminate vibra-. tion.

.Each of the partitions 51 has projecting therethrough and seamed thereto a conical or funnel shaped member adapted to cause a contraction of the exhaust gases as they pronot shown, to the mufiier. A tube a 

